Dear Koby,
The Malwarebytes warning that AC is infected is probably just a false positive, possibly triggered by running an AC routine that Malwarebytes considered suspicious, given the laptop's environment.
But "probably" isn't very reassuring.
For peace of mind, download and run some other free antivirus scan, such as AVG or Avira. If that scan comes up clean, you can easily uninstall it (or use it instead of MalwareBytes).
This page offers the 32 or 64 bit free version of AVG:
http://www.majorgeeks.com/files/details/avg_antivirus_free_edition.htmlHere's the free version of Avira:
http://www.majorgeeks.com/files/details/avira_free_antivirus.htmlThink of it as getting a second opinion.
Cheers,
Carl Fogel